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Cheap flights from District of Columbia to Ko Samui from $803

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from District of Columbia to Ko Samui departing on 11/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from District of Columbia to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
1:30 pm - 6:15 pmIAD-USM
40h 45m2 stops
Multiple Airlines Logo
9:10 pm - 7:20 pmUSM-IAD
34h 10m2 stops
$1,144Multiple Airlines
Find Deal
Sat, Nov 29 - Sun, Jan 25
Multiple Airlines Logo
1:30 pm - 6:15 pmIAD-USM
40h 45m2 stops
Multiple Airlines Logo
8:40 pm - 7:20 pmUSM-IAD
34h 40m2 stops
$1,223Multiple Airlines
Find Deal
Sat, Nov 29 - Sun, Jan 25
Turkish Airlines Logo
1:30 pm - 6:15 pmIAD-USM
40h 45m2 stops
Turkish Airlines Logo
1:25 pm - 11:45 amUSM-IAD
34h 20m2 stops
$1,265Turkish Airlines
Find Deal
Sat, Nov 29 - Mon, Jan 26
Turkish Airlines Logo
1:30 pm - 6:15 pmIAD-USM
40h 45m2 stops
Turkish Airlines Logo
1:25 pm - 7:20 pmUSM-IAD
41h 55m2 stops
$1,389Turkish Airlines
Find Deal
Sat, Nov 29 - Fri, Jan 30
Multiple Airlines Logo
9:45 am - 8:00 amIAD-USM
34h 15m3 stops
Multiple Airlines Logo
7:00 pm - 3:30 pmUSM-IAD
32h 30m2 stops
$1,396Multiple Airlines
Find Deal
Tue, Nov 25 - Tue, Dec 9
Multiple Airlines Logo
9:45 am - 8:00 amIAD-USM
34h 15m3 stops
Multiple Airlines Logo
6:15 pm - 3:30 pmUSM-IAD
33h 15m3 stops
$1,403Multiple Airlines
Find Deal
Tue, Nov 25 - Tue, Dec 9
Multiple Airlines Logo
8:35 am - 7:35 pmDCA-USM
47h 00m2 stops
Multiple Airlines Logo
11:40 am - 7:00 pmUSM-DCA
43h 20m2 stops
$1,453Multiple Airlines
Find Deal
Thu, Nov 27 - Fri, Dec 5
Qatar Airways Logo
8:05 pm - 6:25 pmIAD-USM
34h 20m2 stops
Qatar Airways Logo
1:25 pm - 8:20 amUSM-IAD
54h 55m2 stops
$1,510Qatar Airways
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Thu, Nov 27 - Fri, Dec 5
Cathay Pacific Logo
9:41 am - 7:35 pmDCA-USM
45h 54m2 stops
Cathay Pacific Logo
11:40 am - 6:54 pmUSM-DCA
43h 14m2 stops
$1,911Cathay Pacific
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Wed, Dec 10 - Mon, Dec 15
Cathay Pacific Logo
8:35 am - 7:35 pmDCA-USM
47h 00m2 stops
Cathay Pacific Logo
11:40 am - 10:59 pmUSM-DCA
47h 19m2 stops
$2,023Cathay Pacific
Find Deal
Wed, Dec 10 - Mon, Dec 15

Etihad Airways flights from District of Columbia to Ko Samui

Our best Etihad Airways deals on District of Columbia to Ko Samui flight tickets
Etihad Airways
Mar 16
IAD3:35 pmWashington, D.C. Dulles Intl
29h 50m
2 stops
USM8:25 amKo Samui
Mar 25
USM8:50 amKo Samui
60h 15m
2 stops
IAD10:05 amWashington, D.C. Dulles Intl
$994
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Etihad Airways
May 3
IAD3:35 pmWashington, D.C. Dulles Intl
33h 20m
2 stops
USM11:55 amKo Samui
May 16
USM8:50 pmKo Samui
47h 55m
2 stops
IAD9:45 amWashington, D.C. Dulles Intl
$1,003
Find similar

Turkish Airlines flights from District of Columbia to Ko Samui

Our best Turkish Airlines deals on District of Columbia to Ko Samui flight tickets
Turkish Airlines
Nov 29
IAD1:30 pmWashington, D.C. Dulles Intl
40h 45m
2 stops
USM6:15 pmKo Samui
Jan 26
USM1:25 pmKo Samui
34h 20m
2 stops
IAD11:45 amWashington, D.C. Dulles Intl
$1,265
Find similar
Turkish Airlines
Mar 14
IAD2:30 pmWashington, D.C. Dulles Intl
30h 35m
2 stops
USM8:05 amKo Samui
Mar 18
USM1:25 pmKo Samui
41h 55m
2 stops
IAD8:20 pmWashington, D.C. Dulles Intl
$1,338
Find similar
Turkish Airlines
Nov 29
IAD1:30 pmWashington, D.C. Dulles Intl
40h 45m
2 stops
USM6:15 pmKo Samui
Jan 30
USM1:25 pmKo Samui
41h 55m
2 stops
IAD7:20 pmWashington, D.C. Dulles Intl
$1,389
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from District of Columbia to Ko Samui that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 17, 2025.
Use the filters below to find and compare flights from District of Columbia to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-6:15 pm

2 stops40h 45m

Ko Samui

Sun 1/25

9:10 pm-7:20 pm

2 stops34h 10m

$1,144

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-6:15 pm

2 stops40h 45m

Ko Samui

Sun 1/25

8:40 pm-7:20 pm

2 stops34h 40m

$1,223

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-6:15 pm

2 stops40h 45m

Ko Samui

Mon 1/26

1:25 pm-11:45 am

2 stops34h 20m

$1,265

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-6:15 pm

2 stops40h 45m

Ko Samui

Fri 1/30

1:25 pm-7:20 pm

2 stops41h 55m

$1,389

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 11/25

9:45 am-8:00 am

3 stops34h 15m

Ko Samui

Tue 12/9

7:00 pm-3:30 pm

2 stops32h 30m

$1,396

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 11/25

9:45 am-8:00 am

3 stops34h 15m

Ko Samui

Tue 12/9

6:15 pm-3:30 pm

3 stops33h 15m

$1,403

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 11/27

8:35 am-7:35 pm

2 stops47h 00m

Ko Samui

Fri 12/5

11:40 am-7:00 pm

2 stops43h 20m

$1,453

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 11/27

8:05 pm-6:25 pm

2 stops34h 20m

Ko Samui

Fri 12/5

1:25 pm-8:20 am

2 stops54h 55m

$1,510

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 12/10

9:41 am-7:35 pm

2 stops45h 54m

Ko Samui

Mon 12/15

11:40 am-6:54 pm

2 stops43h 14m

$1,911

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 12/10

8:35 am-7:35 pm

2 stops47h 00m

Ko Samui

Mon 12/15

11:40 am-10:59 pm

2 stops47h 19m

$2,023

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 11 resultsSorted by cheapest first
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See travel insights to Ko Samui from

How to get the cheapest flight ticket from District of Columbia to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Ko Samui?

Our data shows that Wednesday is the least expensive day to fly to Ko Samui. Tickets to fly out on this day can be as low as $325. Flights from District of Columbia to Ko Samui on a Sunday will generally be more expensive and average around $714. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our data shows that the cheapest District of Columbia to Ko Samui flights are usually those with departure times in the evening. Our users have found flights to Ko Samui in the evening for as low as $286. At noon is when there is more demand to fly to Ko Samui, so prices are often more expensive at around $399 per ticket.

Cheap District of Columbia to Ko Samui flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from District of Columbia to Ko Samui

Direct flights

None
There are no direct flights from District of Columbia to Ko Samui. There are no popular flight routes from District of Columbia to Ko Samui.
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  • When did momondo last update prices for flights from District of Columbia to Ko Samui Airport?

    Prices for flights from District of Columbia to Ko Samui Airport refresh daily.

  • How old do you have to be to fly from District of Columbia to Ko Samui Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from District of Columbia to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The travel and health documents required for your trip to Ko Samui Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ko Samui Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao
Khanom

Why use momondo?

Why should I use momondo to find a flight deal from District of Columbia to Ko Samui?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from District of Columbia to Ko Samui. momondo saves you time and could save you money on your trip.

Can I find flights from District of Columbia to Ko Samui with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Ko Samui from District of Columbia with this policy.

How can momondo help me find flights from District of Columbia to Ko Samui?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ko Samui from District of Columbia.

I’m not ready to book a flight from District of Columbia to Ko Samui right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of District of Columbia to Ko Samui flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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